SM UB-112 was a German Type UB III submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 16 April 1918 as SM UB-112.
UB-112 was surrendered to the Allies at Harwich on 24 November 1918 in accordance with the requirements of the Armistice with Germany; she was used for explosives trials off Falmouth on 20 November and 1 December 1920, after which the boat was dumped on Castle Beach. The wreck was sold for scrap to R. Roskelly & Rodgers on 19 April 1921 for £125, but remains survive in situ.[1]
See main article: Type UB III submarine. She was built by Blohm & Voss of Hamburg and following just under a year of construction, launched at Hamburg on 15 September 1917. UB-112 was commissioned in the spring the next year under the command of Kptlt. Wilhelm Rhein. Like all Type UB III submarines, UB-112 carried 10 torpedoes and was armed with a 8.82NaN2 deck gun. UB-112 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7420nmi. UB-112 had a displacement of 519lk=inNaNlk=in while surfaced and 649t when submerged. Her engines enabled her to travel at 13.3kn when surfaced and when submerged.
| Date | Name | Nationality | Tonnage[2] | Fate[3] | |
|---|---|---|---|---|---|
| 21 August 1918 | The Stewart’s Court |  United Kingdom | 813 | Sunk | |
| 22 August 1918 | Prunelle | United Kingdom | 579 | Sunk | |
| 23 August 1918 | Heros |  Sweden | 351 | Sunk | |
| 30 September 1918 | Atlantico |  Portugal | 319 | Sunk | |
| 1 October 1918 | Aldebaran | Sweden | 1,683 | Sunk | |
| 1 October 1918 | Gjertrud |  Norway | 593 | Sunk | |
| 2 October 1918 | Bamse | United Kingdom | 1,001 | Sunk | |
| 2 October 1918 | Poljames | United Kingdom | 856 | Sunk | |
| 3 October 1918 | Atlantis | Norway | 1,171 | Sunk | |
| 3 October 1918 | Westwood | United Kingdom | 1,968 | Sunk | |
| 3 October 1918 | A.E. Mc Kinstry |  Canada | 1,960 | Damaged | |
| 4 October 1918 | Nanna | Norway | 1,125 | Sunk |